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Took the car on a longish journey recently, about 15 minutes in I noticed the engine temp wasn't going above 60. It was early hours and freezing cold, so assumed that it was ambient temperature plus not driving far or fast at that point. Turned the heaters on and got no warm air and another 30 minutes later still no rise in engine temp. Thought it might be an air lock in the cooling system, so pulled over at a services, checked coolant & oil levels (both Ok). Bled the coolant lines (from the plastic screw near the windscreen), fluid came out almost straight away. Rest of the journey there and back no change in engine temp and no heat from the blowers. Got home, swapped the coolant temp sensor as that seemed the next likely culprit. Noticed that the coolant level had dropped from Max to Min, so topped up and bled again, some air came out, but again, not a lot. Started the car and left it to idle on the drive, with an occasional blip of the throttle. After a few minutes the temp started rising, got to about 80-90, so I assumed all was good. Car sat for a couple weeks, took it out last night and once again, no warm air and temp gauge sat at 50-60. Checked the rad and hoses, both are getting warm then hot as the engine runs, so assuming that coolant is actually circulating. Oil level hasn't dropped and engine is hot after being driven, so think that side of things is ok. Noticed that there does seem to be a little coolant leaking from the bottom radiator hose. Not sure if it's original, but it's definitely far from new - neither hoses or radiator have been changed in the 11 years I've had the car and up till now there's never been an issue. I'm wondering if the hose has perished and is letting air in, causing a semi permanent air leak / lock. So replacing them is the next job, except, I can't seem to find anywhere online to buy replacements - Can anyone point me in the direction of a supplier. I have the OE part numbers, but searching online either yields "Discontinued" from Audi, or hoses from other sources (such as AutoDoc) that match the part number, but look nothing like what's under the bonnet. Lastly, if it turns out not to be hoses, what should I look for next? I'm assuming the water pump is working as I can feel coolant moving through the hoses and it comes out the bleed screw. I'm reasonably sure the block is ok as it had a strip and rebuild over lockdown and hasn't done more than 1000 miles since, so would welcome any advice or suggestions. TIA

Never a dull moment with this car, new minor I hope issue. Every now and again randomly it makes a short low 2-3 second sound weird errrr noise only on cold start up? Should I be worried or just minor I can ignore? I recall my golf mk4 starter motor for years made a loud horrible sweek on start up but I could not be bothered to spend the money to replace as it did not effect driving the Car.